diff --git a/globusonline/transfer/api_client/__init__.py b/globusonline/transfer/api_client/__init__.py
index 87c67c3..36f09d9 100644
--- a/globusonline/transfer/api_client/__init__.py
+++ b/globusonline/transfer/api_client/__init__.py
@@ -33,6 +33,7 @@
 
 See https://transfer.api.globusonline.org for API documentation.
 """
+from __future__ import print_function
 import os.path
 import os
 import sys
@@ -42,8 +43,14 @@
 import urllib
 import time
 import ssl
-from urlparse import urlparse
-from httplib import BadStatusLine
+try:
+  from urlparse import urlparse
+except:
+  from urllib.parse import urlparse
+try:
+  from httplib import BadStatusLine
+except:
+  from http.client import BadStatusLine
 from datetime import datetime, timedelta
 
 from globusonline.transfer.api_client.verified_https \
@@ -230,14 +237,14 @@ def _request(self, method, path, body=None, content_type=None):
             headers["Content-Type"] = content_type
 
         if self.print_request:
-            print
-            print ">>>REQUEST>>>:"
-            print "%s %s" % (method, url)
+            print("")
+            print(">>>REQUEST>>>:")
+            print("%s %s" % (method, url))
             for h in headers.iteritems():
-                print "%s: %s" % h
-            print
+                print("%s: %s" % h)
+            print("")
             if body:
-                print body
+                print(body)
 
         if self.goauth:
             headers["Authorization"] = "Globus-Goauthtoken %s" % self.goauth
@@ -253,7 +260,7 @@ def do_request():
             response_body = r.read()
             return r, response_body
 
-        for attempt in xrange(self.max_attempts):
+        for attempt in range(self.max_attempts):
             r = None
             try:
                 try:
@@ -298,13 +305,13 @@ def do_request():
                 time.sleep(RETRY_WAIT_SECONDS)
 
         if self.print_response:
-            print
-            print "<<<RESPONSE<<<:"
-            print r.status, r.reason
+            print("")
+            print("<<<RESPONSE<<<:")
+            print(r.status, r.reason)
             for h in r.getheaders():
-                print "%s: %s" % h
-            print
-            print response_body
+                print("%s: %s" % h)
+            print("")
+            print(response_body)
 
         return r, response_body
 
@@ -875,7 +882,7 @@ def set_submit_type(self, type):
         self.req_list = [req for req in self.req_list if req["type"] == type]
         # remap
         keys = [r["type"] + "." + r["name"] for r in self.req_list]
-        self.index_map = dict(zip(keys, xrange(len(keys))))
+        self.index_map = dict(zip(keys, range(len(keys))))
 
     def as_json(self):
         return json.dumps(self.json_data)
@@ -1118,7 +1125,7 @@ def process_args(args=None, parser=None):
             parser.error(auth_method_error)
         username = args[0]
         success = False
-        for i in xrange(5):
+        for i in range(5):
             try:
                 result = get_access_token(username=username)
                 args[0] = result.username
diff --git a/globusonline/transfer/api_client/examples/add-endpoint.py b/globusonline/transfer/api_client/examples/add-endpoint.py
index 44973d2..fdee6ba 100755
--- a/globusonline/transfer/api_client/examples/add-endpoint.py
+++ b/globusonline/transfer/api_client/examples/add-endpoint.py
@@ -29,6 +29,7 @@
 
 For a full list of options, run with -h.
 """
+from __future__ import print_function
 import sys
 import inspect
 from optparse import OptionParser
@@ -81,9 +82,9 @@ def main():
     _, _, data = api.endpoint_create(args[1], **kw)
     setup_key = data.get("globus_connect_setup_key")
     if setup_key:
-        print "GC Setup Key: %s" % setup_key
-    print "Endpoint Name: %s" % data["canonical_name"]
-    print data["message"]
+        print("GC Setup Key: %s" % setup_key)
+    print("Endpoint Name: %s" % data["canonical_name"])
+    print(data["message"])
 
 
 if __name__ == '__main__':
diff --git a/globusonline/transfer/api_client/examples/create_proxy.py b/globusonline/transfer/api_client/examples/create_proxy.py
index c223c6c..ad20c1d 100755
--- a/globusonline/transfer/api_client/examples/create_proxy.py
+++ b/globusonline/transfer/api_client/examples/create_proxy.py
@@ -18,14 +18,14 @@
 transfer_api meant for delegate_proxy activation. This can be useful
 for testing.
 """
-
+from __future__ import print_function
 import sys
 
 from globusonline.transfer.api_client import create_proxy_from_file
 
 if __name__ == '__main__':
     if len(sys.argv) != 4:
-        print "usage: %s proxy_file pubkey_file lifetime_hours" % sys.argv[0]
+        print("usage: %s proxy_file pubkey_file lifetime_hours" % sys.argv[0])
         sys.exit(1)
 
     proxy_file, pubkey_file = sys.argv[1:3]
@@ -35,4 +35,4 @@
         public_key = f.read()
 
     proxy_pem = create_proxy_from_file(proxy_file, public_key, lifetime)
-    print proxy_pem
+    print(proxy_pem)
diff --git a/globusonline/transfer/api_client/examples/delegate_proxy_activate.py b/globusonline/transfer/api_client/examples/delegate_proxy_activate.py
index 51aeded..5d5b082 100755
--- a/globusonline/transfer/api_client/examples/delegate_proxy_activate.py
+++ b/globusonline/transfer/api_client/examples/delegate_proxy_activate.py
@@ -63,7 +63,7 @@
     ep = args[0]
     cred_file = args[1]
 
-    print "Using x509_proxy implementation '%s'" % x509_proxy.implementation
+    print("Using x509_proxy implementation '%s'" % x509_proxy.implementation)
 
     _, _, reqs = api.endpoint_activation_requirements(ep,
                                                       type="delegate_proxy")
@@ -72,4 +72,4 @@
     reqs.set_requirement_value("delegate_proxy", "proxy_chain", proxy)
 
     result = api.endpoint_activate(ep, reqs)
-    print result
+    print(result)
diff --git a/globusonline/transfer/api_client/examples/example.py b/globusonline/transfer/api_client/examples/example.py
index 29fa232..6dfffb6 100755
--- a/globusonline/transfer/api_client/examples/example.py
+++ b/globusonline/transfer/api_client/examples/example.py
@@ -20,6 +20,7 @@
 
 python example.py USERNAME -k ~/.globus/userkey.pem -c ~/.globus/usercert.pem
 """
+from __future__ import print_function
 import time
 from datetime import datetime, timedelta
 
@@ -38,18 +39,18 @@ def tutorial():
     Uses module global API client instance.
     """
     # See what is in the account before we make any submissions.
-    print "=== Before tutorial ==="
-    display_tasksummary(); print
-    display_task_list(); print
-    display_endpoint_list(); print
+    print("=== Before tutorial ===")
+    display_tasksummary(); print("")
+    display_task_list(); print("")
+    display_endpoint_list(); print("")
 
     # auto activate the endpoint, and display before/after.
     display_activation("go#ep1")
     display_activation("go#ep2")
 
-    print "=== Before transfer ==="
-    display_ls("go#ep1"); print
-    display_ls("go#ep2"); print
+    print("=== Before transfer ===")
+    display_ls("go#ep1"); print("")
+    display_ls("go#ep2"); print("")
 
     # submit a transfer
     code, message, data = api.transfer_submission_id()
@@ -61,9 +62,9 @@ def tutorial():
     task_id = data["task_id"]
 
     # see the new transfer show up
-    print "=== After submit ==="
-    display_tasksummary(); print
-    display_task(task_id, False); print
+    print("=== After submit ===")
+    display_tasksummary(); print("")
+    display_task(task_id, False); print("")
 
     # wait for the task to complete, and see the tasks and
     # endpoint ls change
@@ -76,36 +77,36 @@ def tutorial():
         # endpoints is having problems or the user already has a bunch
         # of other active tasks (there is a limit to the
         # number of concurrent active tasks a user can have).
-        print "WARNING: task did not complete before timeout!"
+        print("WARNING: task did not complete before timeout!")
     else:
-        print "Task %s complete with status %s" % (task_id, status)
-        print "=== After completion ==="
-        display_tasksummary(); print
-        display_task(task_id); print
-        display_ls("go#ep2"); print
+        print("Task %s complete with status %s" % (task_id, status))
+        print("=== After completion ===")
+        display_tasksummary(); print("")
+        display_task(task_id); print("")
+        display_ls("go#ep2"); print("")
 
 
 def display_activation(endpoint_name):
-    print "=== Endpoint pre-activation ==="
+    print("=== Endpoint pre-activation ===")
     display_endpoint(endpoint_name)
-    print
+    print("")
     code, reason, result = api.endpoint_autoactivate(endpoint_name,
                                                      if_expires_in=600)
     if result["code"].startswith("AutoActivationFailed"):
-        print "Auto activation failed, ls and transfers will likely fail!"
-    print "result: %s (%s)" % (result["code"], result["message"])
-    print "=== Endpoint post-activation ==="
+        print("Auto activation failed, ls and transfers will likely fail!")
+    print("result: %s (%s)" % (result["code"], result["message"]))
+    print("=== Endpoint post-activation ===")
     display_endpoint(endpoint_name)
-    print
+    print("")
 
 
 def display_tasksummary():
     code, reason, data = api.tasksummary()
-    print "Task Summary for %s:" % api.username
+    print("Task Summary for %s:" % api.username)
     for k, v in data.iteritems():
         if k == "DATA_TYPE":
             continue
-        print "%3d %s" % (int(v), k.upper().ljust(9))
+        print("%3d %s" % (int(v), k.upper().ljust(9)))
 
 
 def display_task_list(max_age=None):
@@ -121,9 +122,9 @@ def display_task_list(max_age=None):
         kwargs["request_time"] = "%s," % min_request_time
 
     code, reason, task_list = api.task_list(**kwargs)
-    print "task_list for %s:" % api.username
+    print("task_list for %s:" % api.username)
     for task in task_list["DATA"]:
-        print "Task %s:" % task["task_id"]
+        print("Task %s:" % task["task_id"])
         _print_task(task)
 
 
@@ -133,21 +134,21 @@ def _print_task(data, indent_level=0):
     for k, v in data.iteritems():
         if k in ("DATA_TYPE", "LINKS"):
             continue
-        print indent + "%s: %s" % (k, v)
+        print(indent + "%s: %s" % (k, v))
 
 
 def display_task(task_id, show_successful_transfers=True):
     code, reason, data = api.task(task_id)
-    print "Task %s:" % task_id
+    print("Task %s:" % task_id)
     _print_task(data, 0)
 
     if show_successful_transfers:
         code, reason, data = api.task_successful_transfers(task_id)
         transfer_list = data["DATA"]
-        print "Successful Transfers (src -> dst)"
+        print("Successful Transfers (src -> dst)")
         for t in transfer_list:
-            print " %s -> %s" % (t[u'source_path'],
-                                 t[u'destination_path'])
+            print(" %s -> %s" % (t[u'source_path'],
+                                 t[u'destination_path']))
 
 
 def wait_for_task(task_id, timeout=120, poll_interval=30):
@@ -175,8 +176,8 @@ def wait_for_task(task_id, timeout=120, poll_interval=30):
 
 def display_endpoint_list():
     code, reason, endpoint_list = api.endpoint_list(limit=100)
-    print "Found %d endpoints for user %s:" \
-          % (endpoint_list["length"], api.username)
+    print("Found %d endpoints for user %s:" \
+          % (endpoint_list["length"], api.username))
     for ep in endpoint_list["DATA"]:
         _print_endpoint(ep)
 
@@ -188,30 +189,30 @@ def display_endpoint(endpoint_name):
 
 def _print_endpoint(ep):
     name = ep["canonical_name"]
-    print name
+    print(name)
     if ep["activated"]:
-        print "  activated (expires: %s)" % ep["expire_time"]
+        print("  activated (expires: %s)" % ep["expire_time"])
     else:
-        print "  not activated"
+        print("  not activated")
     if ep["public"]:
-        print "  public"
+        print("  public")
     else:
-        print "  not public"
+        print("  not public")
     if ep["myproxy_server"]:
-        print "  default myproxy server: %s" % ep["myproxy_server"]
+        print("  default myproxy server: %s" % ep["myproxy_server"])
     else:
-        print "  no default myproxy server"
+        print("  no default myproxy server")
     servers = ep.get("DATA", ())
-    print "  servers:"
+    print("  servers:")
     for s in servers:
         uri = s["uri"]
         if not uri:
             uri = "GC endpoint, no uri available"
-        print "    " + uri,
+        print("    " + uri,)
         if s["subject"]:
-            print " (%s)" % s["subject"]
+            print(" (%s)" % s["subject"])
         else:
-            print
+            print("")
 
 
 def display_ls(endpoint_name, path=""):
@@ -222,13 +223,13 @@ def display_ls(endpoint_name, path=""):
     # and will be mapped to the user's default directory (typically
     # their home directory) by the Transfer API.
     path = data["path"]
-    print "Contents of %s on %s:" % (path, endpoint_name)
+    print("Contents of %s on %s:" % (path, endpoint_name))
     headers = "name, type, permissions, size, user, group, last_modified"
     headers_list = headers.split(", ")
-    print headers
+    print(headers)
     for file_or_dir in data["DATA"]:
-        print ", ".join([unicode(file_or_dir[field])
-                         for field in headers_list])
+        print(", ".join([unicode(file_or_dir[field])
+                         for field in headers_list]))
 
 
 if __name__ == '__main__':
diff --git a/globusonline/transfer/api_client/examples/myproxy_activate.py b/globusonline/transfer/api_client/examples/myproxy_activate.py
index 5f88fd2..4a46368 100755
--- a/globusonline/transfer/api_client/examples/myproxy_activate.py
+++ b/globusonline/transfer/api_client/examples/myproxy_activate.py
@@ -24,7 +24,7 @@
 The endpoint name may contain a # which is a shell comment, so be sure to
 quote the endpoint name.
 """
-
+from __future__ import print_function
 import sys
 from getpass import getpass
 
@@ -47,8 +47,8 @@ def input_default(field_name, default, private=False):
             if default:
                 value = default
             else:
-                print "Error: %s is required, please enter a value" \
-                    % field_name
+                print("Error: %s is required, please enter a value" \
+                    % field_name)
     return value
 
 
@@ -79,8 +79,8 @@ def prompt_requirement(reqs, req_name, private=False):
 
     try:
         _, _, result = api.endpoint_activate(ep, reqs)
-        print "Activation successful"
-        print "Subject:", result["subject"]
-        print "Expires:", result["expire_time"]
+        print("Activation successful")
+        print("Subject:", result["subject"])
+        print("Expires:", result["expire_time"])
     except APIError as e:
-        print "Error: %s" % e.message
+        print("Error: %s" % e.message)
diff --git a/globusonline/transfer/api_client/goauth.py b/globusonline/transfer/api_client/goauth.py
index 9d961c2..f47a4ff 100755
--- a/globusonline/transfer/api_client/goauth.py
+++ b/globusonline/transfer/api_client/goauth.py
@@ -21,8 +21,12 @@
 for password. The token is printed to stdout.
 """
 
+from __future__ import print_function
 import sys
-import urlparse
+try:
+  import urlparse
+except:
+  from urllib.parse import urlparse
 import getpass
 from collections import namedtuple
 import json
@@ -69,13 +73,13 @@ def get_access_token(username=None, password=None, ca_certs=None):
         from globusonline.transfer.api_client import get_ca
         ca_certs = get_ca(HOST)
     if username is None:
-        print "Globus Online Username: ",
+        print("Globus Online Username: ",)
         sys.stdout.flush()
         username = sys.stdin.readline().strip()
     if password is None:
         password = getpass.getpass("Globus Online Password: ")
 
-    basic_auth = base64.b64encode("%s:%s" % (username, password))
+    basic_auth = base64.b64encode(("%s:%s" % (username, password)).encode('ascii')).decode("ascii")
     headers = { "Content-type": "application/json; charset=UTF-8",
                 "Hostname": HOST,
                 "Accept": "application/json; charset=UTF-8",
@@ -88,7 +92,7 @@ def get_access_token(username=None, password=None, ca_certs=None):
     elif response.status > 299 or response.status < 200:
         raise GOAuthError("error response: %d %s"
                          % (response.status, response.reason))
-    data = json.loads(response.read())
+    data = json.loads(response.read().decode('ascii'))
     token = data.get("access_token")
     if token is None:
         raise GOAuthError("no token in response")
@@ -138,7 +142,7 @@ def process_args(args=None, parser=None):
     try:
         result = get_access_token(ca_certs=options.server_ca_file,
                                   username=username)
-        print result.token
+        print(result.token)
     except Exception as e:
         sys.stderr.write(str(e) + "\n")
         sys.exit(2)
diff --git a/globusonline/transfer/api_client/verified_https.py b/globusonline/transfer/api_client/verified_https.py
index da848e3..1c37209 100644
--- a/globusonline/transfer/api_client/verified_https.py
+++ b/globusonline/transfer/api_client/verified_https.py
@@ -21,12 +21,19 @@
 
 See http://www.muchtooscrawled.com/2010/03/https-certificate-verification-in-python-with-urllib2/
 """
+from __future__ import print_function
 import socket
 import ssl
 import os
 import re
-from httplib import HTTPSConnection
-from urlparse import urlsplit
+try:
+  from httplib import HTTPSConnection
+except:
+  from http.client import HTTPSConnection
+try:
+  from urlparse import urlsplit
+except:
+  from urllib.parse import urlsplit
 
 
 __all__ = ["VerifiedHTTPSConnection"]
@@ -199,10 +206,10 @@ def exit_usage():
             sys.exit("Timout!")
         else:
             raise
-    print r.status, r.reason
+    print(r.status, r.reason)
     for h in r.getheaders():
-        print "%s: %s" % h
-    print r.read(),
+        print("%s: %s" % h)
+    print(r.read(),)
 
 
 if __name__ == '__main__':